Imaging and monitoring of tumor associated macrophages more efficient than (89)Zr-rHDL imaging agent alone (26112022), rHDL labeled with 99mTc and hydrazinonicotinic acid is an effective new radio-tracer for labeling tumors (30543234), apoE3 rHDL-AuNP results in effective labeling of LDLR overexpressing cancer cell lines (29225464). The gene discussed is LDLR; the disease is cancer.